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Turn everything in the kitchen upside down. Microwaves, toasters, bins, the whole lot - it usually takes people a moment to realise what's wrong, but when they do, cue disbelief and hysterical laughter - great fun!

 AlexHolker wrote:
Do not tamper with people's food. Do not do anything that could get them in trouble with their landlord. Do not violate their ability to feel secure in their home for your own sick pleasure. Do not do anything that has consequences that last longer than their amusement.

In short, do not be a horrible excuse for a human being.

Why do I feel like this is directed at me? Food? Check. Landlord pissed? Check. Not feeling secure? I suppose the hair dye could do that. It's at me. alternatively, so that Alex approves, duct tape their entire door frame. They'll have to tear it all off to get in. Harmless and time consuming for them. Shoving popcorn kernels under the door and creating a serious welcome may out of the things would be good too. Especially if they like to go barefoot. now I'm getting evil again.

If possible gain access to their room. Remove the lightbulb, as well as the on in the hall/room adjoining their bedroom. Black out their windows. There are now several ways you can take this.

#1-Cover the floor in both rooms in leggos. When they come back, they will tread on them and have to cross a minefield to gain access to their room and so on.
#2-Rig stink bombs above the door. When they open it, they will be assaulted by an unholy stench.
#3-Aquire an axe and fake blood. Cover their room in fake blood. I mean, really go wild. If possible, aqquire fake body parts too. Spread them as best you can. Spread some hear and there around the apartment too. Really subtely. Ad cover the axe in it. When they come back, pull on a dirty set of clothes with some fake blood stains. Act slightly feral. When they open the door to their room, let them enter, then produce the axe, sneak up behind them and scream in your most blood curdling manner.
#4-Glue everything in their room upside down. To the ceiling if possible.
#5-Do nothing, but act suspicous. Their imagination will do the rest.
#6-Remove ALL their things. When they get back, pretend not to know them. Act like they are a complete stranger.
#7-Put clingfilm over their door. If you do this you dont need access to their room. Just kill the lights in the adjoining room.

Alright, some really good stuff here, keep it coming!

I'm not gonna do the butter on the floor one... that's just a dick move

Can't unscrew the lightbulb... food is definitely doable. Loving the cress seeds idea

 liquidjoshi wrote:
Can't unscrew the lightbulb... food is definitely doable. Loving the cress seeds idea

Your flatmates likely have better things to do than put up with your gak. They may have jobs, or may be stressed because they don't have jobs. They don't need some donkey-cave making their lives difficult.

 AlexHolker wrote:

 liquidjoshi wrote:
Can't unscrew the lightbulb... food is definitely doable. Loving the cress seeds idea

Your flatmates likely have better things to do than put up with your gak. They may have jobs, or may be stressed because they don't have jobs. They don't need some donkey-cave making their lives difficult.

Dude, you really need to loosen up...

What we've done in my house this year

- Freeze their shoes/cutlery
- Leave a couple of dildos in their cuboards
- Pressing the test button on the smoke alarms will set them off, although this might not work in halls if you have a proper alarm system that summons the fire brigade.
- Cling-filming their car, or as we did, sticking dozens of sanitary towels, spelling out "gakker" and other such words on the windscreen
- If they have bottled water, replace it with salt-water or vodka.

The problem with Valkyrie's vodka-substitute tactic, in my experience, is that some people find that quite a welcome surprise!

Provided you are a good actor and one of them is single, convince them that they actually have a partner. Perhaps tell them that their girlfriend called and asked you to leave a message and keep up the act despite their protests. Getting other people to back you up helps as well. Certain to mess with anyone's mind!

Something like this..

 Dark Apostle 666 wrote:
Turn everything in the kitchen upside down. Microwaves, toasters, bins, the whole lot - it usually takes people a moment to realise what's wrong, but when they do, cue disbelief and hysterical laughter - great fun!

Get a friend to help with the fridge. That would be even better.

 AlexHolker wrote:
In short, do not be a horrible excuse for a human being.

Unless it's reeeeeaally funny But they require a sense of humor or you can lose friends.
If there's a gap under the door and you don't know how to pick locks there's a decent trick to use. The old 'filling their room with balloons gag works best if you can get in, but if you can't and there's a gap large enough, borrow/rent an air compressor. Attach a balloon to the end of the hose and stick it under just enough so that when you fill it up the balloon will fill up on the other side, but leave you enough room to tie it off. Do that a few hundred times. The balloons will get out of the way as you add more until it reaches a critical mass. Stop when you hear popping every time you fill one up. Safe, only slightly annoying, and the look on their faces will be priceless.
The coffee one is another good one, which can also be replaced by a red powder so it looks like blood.
Take something of theirs (like keys if you can find them) put them in a jug of water, then put it in the freezer. Even better if you do it by freezing half the jug first, then putting the keys in so it's stuck in the middle.
If they're paranoid I really like the idea of doing VERY VERY LITTLE and leaving the impression you did more. That truly is the best prank ever, because they will do more to themselves searching for your pranks than you ever will by doing it yourself. Occasionally get 'caught' outside their door, or with their stuff in the fridge looking mischievous. Giggle after random things they do. When asked why, just say 'no reason'.
One thing to note: Are you ready to face the consequences of this? Because with most people this WILL start a war, one that will escalate.
Also, if you could get into their room and you know some plumber/builder types you can try pulling off this prank: http://youtu.be/HG_wfMK7dko do it to the right person and they'll even thank you

 AlexHolker wrote:
Do not tamper with people's food. Do not do anything that could get them in trouble with their landlord. Do not violate their ability to feel secure in their home for your own sick pleasure. Do not do anything that has consequences that last longer than their amusement.

In short, do not be a horrible excuse for a human being.

I like that one the best of all.